We have been using tthis setup to record data from a load cell and linear displacement transducer and were previously achieving steady results, but something has changed and now whatever is in channel A will not give a steady change with applied pressure or a change in height. Both of these work fine on port B but jump between values on port A. These values are always the same 3/4 numbers, this is not the output from testing with a Thurlby 1503 digital multimeter. We have tested every component from the input to the computer and cannot work out why this is happening.

Any help to achieve a normal set of values would be greatly appreciated.